A recording anemometer.

Apparatus designed to measure and record the size distribution of raindrops as they occur in the atmosphere.

Water vapor content of the air. See absolute humidity, dew point, mixing ratio, relative humidity, specific humidity.

A power supply which achieves its output regulation by means of one or more active power handling devices which are alternately placed in the "off" or "on" states. It is more efficient than linear supplies which vary the conduction of power devices to ach ...

pattern barometer-Mercurial barometer with a fixed scale and cistern and which therefore requires only one adjustment before each reading.

Any quantity, such as force velocity, or acceleration, which has both magnitude and direction at each point in space, as opposed to scalar which has magnitude only. Such a quantity may be represented geometrically by an arrow of length proportional to its ...

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

A liquid-in-glass thermometer which uses an organic substance such as alcohol as the thermometer liquid. This type of thermometer has a low freezing point and a high coefficient of expansion. It is less accurate, however, than a mercury thermometer.

An instrument that shows changes in humidity.

An elongated area of relatively high pressure. Usually associated with and most clearly identified as an area of maximum anticyclonic curvature of the wind flow. The opposite of a trough.

American Standard Code for Information Interchange. A standard code used to represent data using 8 bits (7 data bits and I parity bit) per character.

Precipitation of white, opaque, spherical or conical ice particles that are crisp and easily crushed and that have diameters of 2 to 5 mm.

Abbreviation for the pressure, temperature, and humidity data obtained by a radiosonde observation.

The most common of the principal rainbow phenomena, which appears as an arc of about 42

Navy Operational Global Atmospheric Prediction System. A global meteorological model operated by the Department of Defense.

The limiting values of ceiling, visibility, and wind, or runway visual range, established as safety minimum for aircraft landings and take-offs.

Name sometimes given to a transmissometer.

A fabric cone attached to a metal ring and used to indicate wind direction. often at airfields.

Same as water year.

An instrument for measuring the pressure of gases and vapors. A mercury barometer is a type of manometer.